<script>
import {defineComponent} from 'vue'

export default defineComponent({
  name: "Count",
  data() {
    return {
      sum: 0,//当前的和
      n: 1,//用户选择的数字
    }
  },
  methods: {
    increment() {
      this.sum += this.n
    },
    decrement() {
      this.sum -= this.n

    },
    incrementOdd() {
      if (this.sum % 2 !== 0) {
        this.sum += this.n
      }
    },
    incrementWait() {
      setTimeout(() => {
        this.sum += this.n
      }, 1000)
    },
  }
})
</script>

<template>
  <div>
    <h1>当前求和为{{ sum }}</h1>
    <select v-model.number="n">
      <option value="1">1</option>
      <option value="2">2</option>
      <option value="3">3</option>
    </select>
    <button @click="increment">+</button>
    <button @click="decrement">-</button>
    <button @click="incrementOdd">求和为奇数再加</button>
    <button @click="incrementWait">等等再加</button>
  </div>
</template>

<style scoped lang="less">

</style>
